Spring Pest Prevention: Seal Your Home Before Bugs Move In

Why spring is the critical window

Most household pests — ants, termites, cockroaches, spiders, mice, and wasps — become active when temperatures consistently reach 50–60°F (10–15°C). They spend winter dormant in walls, soil, and mulch beds, then start foraging and breeding in spring. Sealing entry points in March or April prevents infestations that become entrenched by summer. Reactive pest control (spraying after you see pests) costs 3–5x more than prevention and often requires multiple treatments.

Exterior inspection checklist

• Foundation gaps — walk the entire perimeter and look for cracks wider than 1/16 inch in the foundation, slab, or mortar joints. Seal with exterior-grade silicone caulk or hydraulic cement for larger cracks
• Utility penetrations — pipes, wires, and cables entering the house create gaps that insects exploit. Seal around each penetration with expanding foam or caulk
• Door sweeps and thresholds — if you can see daylight under an exterior door, pests can enter. Replace worn door sweeps and adjust thresholds so they contact the sweep with no gaps
• Window screens — inspect every screen for holes, tears, or frames that don't seat tightly. Patch small holes with screen repair kits; replace screens with large tears
• Soffit and eave gaps — wasps and bats enter through gaps where the soffit meets the wall. Seal with caulk or install soffit vent screens
• Garage door seal — the rubber seal along the bottom wears out and leaves gaps. Replace for $20–$50 in materials

Moisture control — the #1 pest attractant

Nearly every common household pest — termites, ants, cockroaches, silverfish, centipedes — requires moisture. Eliminating moisture sources is the single most effective pest prevention strategy:

• Fix any leaking faucets, pipes, or hose bibs — even small drips create enough moisture for ant colonies
• Ensure gutters and downspouts direct water at least 4 feet away from the foundation
• Grade soil away from the foundation (6 inches of drop over the first 10 feet)
• Repair or install vapor barriers in crawl spaces — exposed soil in crawl spaces creates ideal conditions for termites
• Run bathroom and kitchen exhaust fans during and 15 minutes after showers and cooking
• Check the AC condensate drain line — a clogged line creates standing water that attracts pests

Landscaping adjustments

• Mulch distance — keep mulch, wood chips, and decorative bark at least 12 inches away from the foundation. Mulch holds moisture and provides habitat for termites, ants, and beetles
• Tree and shrub contact — trim branches and shrubs so nothing touches the house. Branches act as highways for ants, roaches, and rodents to reach upper floors and the roof
• Firewood storage — stack firewood at least 20 feet from the house and 5 inches off the ground. Woodpiles are termite and carpenter ant magnets
• Standing water — empty birdbaths weekly, fix low spots in the yard where water pools, and ensure plant pot saucers drain. Standing water breeds mosquitoes

When to call a professional

A handyman can handle sealing, caulking, door sweep replacement, and screen repair — tasks that cost $200–$500 for a half-day visit. If you discover termite damage (hollow-sounding wood, mud tubes on the foundation), call a licensed pest control company immediately — termite treatment costs $500–$2,500 but delaying causes exponentially more structural damage. A plumber should handle any active leaks, and a landscaper can regraded soil and manage vegetation near the foundation.